Seems the logic would work perfectly well in making it appear to be more realistic for the very reason you mentioned.

Yes, add random names so that a forged ball that could have been passed off as valuable is now a forged ball that's worthless. That'll fool everybody, Mr. Jinx!!!

The "Pawn Stars" workers don't know what they're doing when it comes to sports memorabilia unless they bring in their expert. Most Letters of Authenticy are worthless. If you can forge an autograph/item you can certainly forge a piece of paper.